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<title>Using as: MMIX-Chars</title>

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Next: <a href="MMIX_002dSymbols.html#MMIX_002dSymbols" accesskey="n" rel="next">MMIX-Symbols</a>, Up: <a href="MMIX_002dSyntax.html#MMIX_002dSyntax" accesskey="u" rel="up">MMIX-Syntax</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Special-Characters-22"></a>
<h4 class="subsubsection">9.28.3.1 Special Characters</h4>
<a name="index-line-comment-characters_002c-MMIX"></a>
<a name="index-MMIX-line-comment-characters"></a>

<p>The characters &lsquo;<samp>*</samp>&rsquo; and &lsquo;<samp>#</samp>&rsquo; are line comment characters; each
start a comment at the beginning of a line, but only at the beginning of a
line.  A &lsquo;<samp>#</samp>&rsquo; prefixes a hexadecimal number if found elsewhere on a
line.  If a &lsquo;<samp>#</samp>&rsquo; appears at the start of a line the whole line is
treated as a comment, but the line can also act as a logical line
number directive (see <a href="Comments.html#Comments">Comments</a>) or a preprocessor control command
(see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).
</p>
<p>Two other characters, &lsquo;<samp>%</samp>&rsquo; and &lsquo;<samp>!</samp>&rsquo;, each start a comment anywhere
on the line.  Thus you can&rsquo;t use the &lsquo;<samp>modulus</samp>&rsquo; and &lsquo;<samp>not</samp>&rsquo;
operators in expressions normally associated with these two characters.
</p>
<p>A &lsquo;<samp>;</samp>&rsquo; is a line separator, treated as a new-line, so separate
instructions can be specified on a single line.
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